AT90USB1286-16MU ATMEL [ATMEL Corporation], AT90USB1286-16MU Datasheet - Page 293

• Manufacturer Part Number: AT90USB1286-16MU
• Description: Microcontroller with 64/128K Bytes of ISP Flash and USB Controller
• Manufacturer: ATMEL [ATMEL Corporation]

23. USB Host Operating Modes
23.1
23.2
23.3
7593A–AVR–02/06
Pipe description
Detach
Power-on and Reset
For the USB Host controller, the term of Pipe is used instead of Endpoint for the USB Device
controller. A Host Pipe corresponds to a Device Endpoint, as described in the USB specification:
Figure 23-1. Pipes and Endpoints in a USB system
In the USB Host controller, a Pipe will be associated to a Device Endpoint, considering the
Device Configuration Descriptors.
The reset value of the DETACH bit is 1. Thus, the firmware has the responsibility of clearing this
bit before switching to the Host mode (HOST set).
The next diagram explains the USB host controller main states on power-on:
Figure 23-2. USB host controller states after reset
Clock stopped
Ready
Host
Device
connection
Macro off
Device
disconnection
SOFE=1
SOFE=0
Host
Idle
Suspend
Device
disconnection
Host
state>
<any
other
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